Paper Title:
Bioactive Hydroxyapatite/Calcium Silicate Composites Obtained by Fast Hot Pressing: Structure and Flexural Strength
  Abstract

The present work deals with the preparation and characterization of ceramic composites for the substitution of load-bearing bone portions, made of hydroxyapatite (HA) and bioactive β- calcium silicate (β-Ca2SiO4) as a reinforcing phase. The composite materials were prepared by Fast Hot-Pressing technique (FHP), which allowed the rapid sintering of monolithic ceramics at temperatures up to 1500 °C, well above the commonly adopted temperatures for sintering of hydroxyapatite (1200-1300 °C), in order to achieve the densification of the reinforcing phase also. XRD analysis reported no formation of secondary phases other than HA and β-Ca2SiO4, after FHP cycles. Flexural strength tests were performed on selected samples sintered at different temperatures: the composite materials exhibited increased mechanical resistance compared to samples constituted of HA only. These preliminary results confirmed that composites of HA and β- Ca2SiO4 are promising for the development of bioactive load-bearing ceramic bone substitutes.

  Info
Periodical
Key Engineering Materials (Volumes 361-363)
Main Theme
Edited by
Guy Daculsi and Pierre Layrolle
Pages
423-426
DOI
10.4028/www.scientific.net/KEM.361-363.423
Citation
S. Sprio, A. Tampieri, E. Landi, G. C. Celotti, D. Dalle Fabbriche, "Bioactive Hydroxyapatite/Calcium Silicate Composites Obtained by Fast Hot Pressing: Structure and Flexural Strength", Key Engineering Materials, Vols. 361-363, pp. 423-426, 2008
Online since
November 2007
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